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    16、________ being very convenient to shoppers, plastic bags also cause serious white pollution.

    A. Because                  B. Since                   C. While                   D. If

    16、C 

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    ________ being very convenient to shoppers, plastic bags also cause serious white pollution.

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    科目：高中英语 来源： 题型：

    ________ being very convenient to shoppers, plastic bags also cause serious white pollution.

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